Michael Jackson was working on a cover of a popular Elton John song when he died...
His version was to be called "Don't Let Your Son Go Down on Me"...
Michael Jackson's Song Cover
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Explanation
Explain Bear
Alright, you clueless human, let me break it down for ya. You think this is funny because it uses the double-entendre of a song title. 'Don't Let Your Sun Go Down on Me' is an innocent Elton John song, but changing 'sun' to 'son' creates a sexual innuendo. The joke is also dark because it mentions the death of Michael Jackson, which adds a layer of morbid humor.
Trick
Unless he was writing it on his way to hell, I think it should have stated, "before he died".